{"id":"DEBIAN-CVE-2024-56541","details":"In the Linux kernel, the following vulnerability has been resolved:  wifi: ath12k: fix use-after-free in ath12k_dp_cc_cleanup()  During ath12k module removal, in ath12k_core_deinit(), ath12k_mac_destroy() un-registers ah-\u003ehw from mac80211 and frees the ah-\u003ehw as well as all the ar's in it. After this ath12k_core_soc_destroy()-\u003e ath12k_dp_free()-\u003e ath12k_dp_cc_cleanup() tries to access one of the freed ar's from pending skb.  This is because during mac destroy, driver failed to flush few data packets, which were accessed later in ath12k_dp_cc_cleanup() and freed, but using ar from the packet led to this use-after-free.  BUG: KASAN: use-after-free in ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k] Write of size 4 at addr ffff888150bd3514 by task modprobe/8926 CPU: 0 UID: 0 PID: 8926 Comm: modprobe Not tainted 6.11.0-rc2-wt-ath+ #1746 Hardware name: Intel(R) Client Systems NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0067.2021.0528.1339 05/28/2021  Call Trace:   \u003cTASK\u003e   dump_stack_lvl+0x7d/0xe0   print_address_description.constprop.0+0x33/0x3a0   print_report+0xb5/0x260   ? kasan_addr_to_slab+0x24/0x80   kasan_report+0xd8/0x110   ? ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k]   ? ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k]   kasan_check_range+0xf3/0x1a0   __kasan_check_write+0x14/0x20   ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k]   ath12k_dp_free+0x178/0x420 [ath12k]   ath12k_core_stop+0x176/0x200 [ath12k]   ath12k_core_deinit+0x13f/0x210 [ath12k]   ath12k_pci_remove+0xad/0x1c0 [ath12k]   pci_device_remove+0x9b/0x1b0   device_remove+0xbf/0x150   device_release_driver_internal+0x3c3/0x580   ? __kasan_check_read+0x11/0x20   driver_detach+0xc4/0x190   bus_remove_driver+0x130/0x2a0   driver_unregister+0x68/0x90   pci_unregister_driver+0x24/0x240   ? find_module_all+0x13e/0x1e0   ath12k_pci_exit+0x10/0x20 [ath12k]   __do_sys_delete_module+0x32c/0x580   ? module_flags+0x2f0/0x2f0   ? kmem_cache_free+0xf0/0x410   ? __fput+0x56f/0xab0   ? __fput+0x56f/0xab0   ? debug_smp_processor_id+0x17/0x20   __x64_sys_delete_module+0x4f/0x70   x64_sys_call+0x522/0x9f0   do_syscall_64+0x64/0x130   entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f8182c6ac8b  Commit 24de1b7b231c (\"wifi: ath12k: fix flush failure in recovery scenarios\") added the change to decrement the pending packets count in case of recovery which make sense as ah-\u003ehw as well all ar's in it are intact during recovery, but during core deinit there is no use in decrementing packets count or waking up the empty waitq as the module is going to be removed also ar's from pending skb's can't be used and the packets should just be released back.  To fix this, avoid accessing ar from skb-\u003ecb when driver is being unregistered.  Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00214-QCAHKSWPL_SILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3","modified":"2026-09-15T09:03:15.700123325Z","published":"2024-12-27T14:15:33.767Z","upstream":["CVE-2024-56541"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-56541"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-56541.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-56541.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}